Adult Sperm Whales (Physeter macrocephalus) logging on the surface. Upper Gulf of California (Sea of Cortez), Mexico.

Adult Sperm Whale bull (Physeter macrocephalus) surfacing (note tooth rake marks on melon) in the upper Gulf of California (Sea of Cortez), Mexico.

Sperm Whale (Physeter macrocephalus) Sub-adult surfacing (note the peeling skin) Near Islam San Pedro Martir in the midriff region of the Gulf of California (Sea of Cortez), Mexico. (rr)

Sperm Whale (Physeter macrocephalus) Assorted teeth from lower jaws of beached Sperm Whales in the mid-riff region of the Gulf of California (Sea of Cortez), Mexico.

Sperm Whale (Physeter macrocephalus) fluke-up dive at sunset. Mid-riff region of the Gulf of California (Sea of Cortez), Mexico. (rr)

Sperm Whale (Physeter macrocephalus) Woman with an eight-inch tooth from lower right mandible (jawbone) of an adult bull Sperm Whale in the mid-riff region of the Gulf of California (Sea of Cortez), Mexico. Model released.

Blue Whale (Balaenoptera musculus) Mother and calf fluke-up dive in the Gulf of California (Sea of Cortez), Mexico.

Sperm whale. (Physeter macrocephalus). A sperm whale tail at the start of a deep dive. Gulf of California.

Sperm Whale, Physeter macrocephalus, calf, head detail, in the northern Gulf of California, Mexico